Device for fixing a test person on a standing surface

ABSTRACT

The invention relates to a device for fixing a test person on a standing surface, wherein at least one rope is tensioned between a hip belt placed on the test person and a retaining plate arranged below the standing surface.

The invention relates to a device for fixing a test person on a standingsurface.

In particular, the invention relates to a device that allows persons tobe fixed under weightlessness, such that they can apply forces to theirstanding surface (supporting surface).

Customary devices are based on foot bindings and rope systems. The footbindings generally serve for movement and fixing in stationary work, buta use for sports activities is not ruled out. The rope systems aremostly anchored in, the floor and fix the person, with the aid of aharness on the upper body, to the structure of the spacecraft. The footbindings do not permit permanent fixing. Moreover, they are not suitablefor fixing a test person with variable force on the supporting surface.Although the rope systems permit variable fixing of the person, theirarrangement means that they also offer great lateral constrainingforces.

Standard exercises, e.g. standing on one leg or on both legs with theeyes closed, are based on the test person being intended to remainstanding as still as possible for a defined time interval, with anymovement being recorded and evaluated. Such exercises are possible onlyto a limited extent with the customary devices.

The object of the invention is to make available a device for fixing atest person on a standing surface, in which the lateral constrainingforces are reduced, while variable vertical forces can still act on thetest person.

This object is achieved with the device having the features of currentclaim 1. Advantageous embodiments are the subject matter of dependentclaims.

According to the invention, at least one rope is tensioned between awaist belt, which is placed on the test person, and a retaining plate,which is arranged below the standing surface.

The fixing is such that it can exert on the test person a variablevertical (gravity-simulating) force and minimizes the horizontal forcesthat arise. The nature of the fixing allows the person maximum freedomof movement, without having to exert restoring or supporting forces forthe movement, which is an important requirement especially forcoordinated balance training.

At least two ropes are expediently tensioned between the waist belt andthe retaining plate. Moreover, the standing surface advantageously hasan opening, through. which the ropes are guided. This opening issuitably located in the area of the center of gravity of the testperson, as projected vertically onto the standing surface. The ropes areexpediently guided in such a way that the ropes do not touch the testperson. Depending on the height of the test person, i.e. on the heightof the waist belt above the standing surface, it may be necessary tofasten the ropes to the waist belt by means of a horizontal spacing.

The invention and advantageous embodiments thereof are explained in moredetail with reference to figures, in which:

FIG. 1 shows a first embodiment of the invention,

FIG. 2 shows a second embodiment of the invention,

FIG. 3 shows a third embodiment of the invention,

FIG. 4 shows a fourth embodiment of the invention.

In the first embodiment, shown in FIG. 1, elastic ropes S areexpediently brought together at a fastening point P on the retainingplate H. Two ropes are provided by way of example in FIG. 1, one rope S₁being fastened at the front in the area of the stomach of the to personT, and the other rope S₂ being fastened at the rear in the area of theback.

The fastening point P is in this case expediently chosen such that it issituated in the plane enclosed by the normal to the standing surface SFand the projection of the body's center of gravity KS onto the standingsurface SF. A dedicated fastening point P in said plane can expedientlybe chosen for each rope.

The standing surface SF expediently has an opening O (enlarged view),which is formed in the area of the center of gravity KS of the testperson, as projected vertically onto the standing surface SF. Theretaining plate H expediently has an extent greater than the opening O.The retaining plate H is mounted below the standing surface SF in such away that it can move freely in the horizontal plane (arrow direction).The ropes S₁ and S₂ are guided through the opening O and connect thewaist belt of the test person T to the retaining plate H. In ahorizontal excursion of the waist belt (from position P1 to position P2)of the test person T, the fixing at the fastening point P follows themovement, of the body's center of gravity KS, as a result of which theelastic ropes S₁ and S₂ in turn do not experience any changes in lengthand force during movements in the horizontal plane. In this system,therefore, the only acting force is a vertical force F_(v), whichresults from the stretching of the restraint ropes S₁ and S₂.

In a second embodiment of the invention, shown in FIG. 2, the testperson T is fixed on the standing surface SF with, for example, the aidof two intersecting elastic ropes S₁ and S₂ To make the figure clearer,the ropes S₁ and S₂ are each applied to the side of the waist belt ofthe test person T. However, it may also be expedient to use four ropes,in which case a further rope is fastened in the area of the stomach andanother in the area of the back of the test person T, optionally alsooffset by 45°, i.e. laterally outward in front of or behind the hip (notshown).

The retaining plate H is expediently arranged at a distance d below theunderside of the standing surface SF. The retaining plate H is notmovable in this embodiment, e.g. the retaining plate is connectedfixedly to the underside of the standing surface SF by means of a spacerH. The explanations set forth concerning the opening O in the firstembodiment apply also in this embodiment.

The fastening points B₁ and B2 of the elastic ropes S₁ and S₂ on theretaining plate H are chosen such that the ropes S₁ and S2 intersect atthe intersection SF with the standing surface SF. The advantage of thisarrangement lies in the very small space required and in the very lowhorizontal forces. Firstly, as a result of the relatively large anglethat the ropes S₁ and S₂ enclose with the standing surface SF, thecosine component of the tensile force is much lower than with bracing tothe sides, and, secondly, the X-shaped arrangement of the ropes S₁ andS₂ causes alternating horizontal forces F. Thus, the horizontalrestoring forces F_(HL) initially increase during a movement fromposition 1 to position 2, and they reach their maximum when the rope S₁is perpendicular to the standing surface SF, after which the restoringforce decreases again.

The third embodiment of the invention is shown in FIG. 3. At least threedeflection rollers U (for drawing reasons only 2 rollers are indicated)are arranged on the retaining plate H in such a way that the center ofgravity of the area (not shown) formed by the deflection rollers Ucoincides with the center of gravity KS of the test person T, asprojected onto the retaining plate H, and one circumferential rope S isguided from the waist belt, placed on the test person T, across thedeflection rollers U and back to the waist belt.

The circumferential steel rope S can be tensioned with the aid of a handwinch. Spring balances can be used to determine the tensioning force. Asa result of the constant rope length, and assuming rollers more or lessfree of friction, the rope always follows the waist. movement in thehorizontal plane. It is clear from FIG. 3 that a waist movement to theright (position 1 to position 2) leads to a slackening of the rope S onthe right-hand side. This shortening of the rope section SA1 (sectionbetween deflection roller and waist belt) on the right-hand side followsa lengthening of the rope section SA2 on the left-hand side, since therope S has a constant length. Because of the slackening of the rope onone side and the simultaneous lengthening of the rope on the other side,the horizontal forces in the system are very substantially reduced. Ifthe waist movement is assumed as an orbit, then there are also minimalvertical movements of the waist, but this has almost no effect on theforce equilibrium in the system. If one assumes a body sway of ±10° onthe indicated orbit, then, in the solution shown, there is a maximumlength difference in the rope of 5 mm. The resulting reduction of thevertical force component F_(v) is very slight.

The fourth embodiment of the invention is shown in FIG. 4. Thisembodiment is a combination of the first and second embodiments. Themovable retaining plate H from the first embodiment (FIG. 1) is arrangedbelow the standing surface by a distance AH. This generates tensioningsimilar to the cruciate ligaments in the knee joint. The rolling/slidingmechanism resulting from the described arrangement has the effect thatthe restraint in the horizontal plane follows the movement of the body'scenter of gravity KS, and possible tilting movements of the body are atte same time compensated by the intersecting ropes S1, S2.

The device according to the invention can be used advantageously inweightlessness, in water or under normal conditions.

With the device according to the invention, vertical forces can begenerated on account of the geometry and mechanics, but possiblehorizontal forces are reduced. The generated vertical forces arenecessary in order to fix the person on the platform underweightlessness, or in order to apply an additional load, similar to aweighted vest.

The reduction of the horizontal forces has the sense that astabilization of the movement by the restraint is prevented.

The aim of such a restraint is not to make training easier for theperson training, e.g. by the additional lateral guide, but to maintainthe degree of difficulty of the training (weightlessness) or increasethe degree of difficulty of the training (on Earth.). This can beachieved by the additional vertical force, which is applied with the aidof the restraint/fixing.

In the advantageous use of the device according to the invention inwater, the buoyancy force on a body immersed in water is used to makethe body virtually weightless. Through the use of the device accordingto the invention in water, e.g. in a tank provided for this purpose, aperson training can be provided with a training regimen which permitstraining in which the exercises can be performed under adjustableloading for the person training. The loading for the person training canbe adjusted, on the one hand, by how deep the person training isimmersed in the water and, on the other hand, by setting the additionalvertical force by the fixing, according to the invention, of the persontraining on the standing surface. The force acting on the persontraining results from the height of the water level in the tank in whichthe person training is situated, and from the vertical force whichcounteracts the buoyancy force and with which the person training isfixed on the standing surface.

Especially in the rehabilitation of injuries, e.g. sports injuries, itis therefore possible, immediately after the medical treatment, toreturn to the training of important movements, initially under reducedloading. The loading reduced by the water also allows the development tobe used in the geriatric sector or in therapy. The loading can beincreased again as training progresses.

The implementation of the advantageous use is known in principle fromother training variants, e.g. from treadmill training under water, butnot for the performance of sensorimotor training. The advarn use of thedevice according to the invention in water therefore represents adevelopment that affords further advantages for the person training.

Besides rehabilitation, therapy, geriatrics and sport, the advantageoususe of the device according to the invention in water also affords avery effective development of the ahovementioned use for the training ofastronauts. By completion of sensorimotor exercises before a spaceflight, which exercises can then be repeated under identical conditionsduring the space flight, it is postulated that the adaptation toweightlessness, with the known problems such as coordinationdifficulties and space sickness, can be overcome more quickly than bythe known methods.

Therefore, even before the start of a mission, the differentgravitational conditions of a target planet can be simulated on earthand trained for. Scientific experiments already carried out lead to theassumption that sensorimotor capabilities, once acquired, can bemaintained by relatively short and regular exercises.

1-8. (canceled)
 9. A device for fixing a test person on a standingsurface, wherein between a waist belt placed on the test person and aretaining plate arranged below the standing surface at least one rope istensioned, wherein at least three deflection rollers are arranged on theretaining plate in such a way that the center of gravity of the areaformed by the deflection rollers coincides with the center of gravity ofthe test person, as projected onto the retaining plate, and onecircumferential rope is guided from the waist belt, placed on the testperson, across the deflection rollers and back to the waist belt. 10.The device as claimed in claim 9, wherein the rope is a flexible steelrope.
 11. Use of a device as claimed in claim 9, in weightlessness or inwater.
 12. Use of a device as claimed in claim 10, in weightlessness orin water.